00544cam a2200181 4500 378867744 TxAuBib 20170402120000.0 170903s2017||||||||||||||||||||||||eng|u 55482 Project Gutenberg PGUSA eng TxAuBib Roth, Lászlo, 1906-2005. Machines at Work [Gutenberg] / Lászlo Roth. Project Gutenberg, 2017. Public domain in the USA. Text. Machinery -- Juvenile literature. http://www.gutenberg.org/ebooks/55482